Using the data furnished in Problem 4-9, draw the histogram frequency distribution and cumulative percentage distribution for each set of data and determine (a) average speed, (b) 85th-percentile speed, (c) 15th-percentile speed, (d) mode, (e) median, and (f) pace.
What will be an ideal response?
(a) average speed = ?ui / ?fi
“before” average = 1053/30 = 35.1 mi/h
“after” average = 824/30 = 27.5 mi/h
(b) 85%-ile speeds from cumulative distribution plots
before = 38.4 mi/h
after = 33.3 mi/h
(c) 15%-ile speeds from cumulative distribution plots
before = 30.8 mi/h
after = 20.5 mi/h
(d) mode from histograms
before = 35 mi/h
after = 21 mi/h
(e) median from cumulative distribution plots
before = 34.5 mi/h
after = 27 mi/h
(f) pace from histograms
before = 30 – 40 mi/h
after = 21 – 31 mi/h
Before data set:
After data set:
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